using System;
class Teste
{
    static double Soma(params double [] dd)
    {
        double soma = 0.0;
        for (int i = 0; i < dd.Length; i++) soma += dd[i];
        return soma;
    }
    static void Treta(int x, int y=88)
    {
        Console.WriteLine(x + y);
    }
    static void Main()
    {
        Console.WriteLine(Soma(new double[] {1.9, 2.3, 4.5}));
        Treta(100); Treta(y:10, x:3);
    }
}